Power of Attorney


I have a question for those who are more legal savvy than I am. I am in Brazil awaiting the birth of my daughter to apply for permanent residency. I write magazine articles that I sell to former clients in the states, and have a fair amount of money arriving at my grandpas house in Williamsburg, VA. I need to assign power of attorney to him so that he can endorse the checks and send the money via Western Union. How do I do this?I have sought legal information online, but all of the free documents seem to need a notary public for authentication. Since I am not in the states,this will be impossible. Any suggestions are much appreciated.